The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2010
Filed:
Nov. 19, 2007
Robert Pulford, Jr., Wolcott, CT (US);
Robert Pulford, Jr., Wolcott, CT (US);
Tritex Corporation, Waterbury, CT (US);
Abstract
A method of providing axially alternating N and S poles in a portion of an axially extending, cylindrical, smooth shaft for a linear stepper motor and a method of manufacturing a magnetizing fixture are provided. A magnetizing fixture is provided including a hollow cylindrical mandrel formed from a non-magnetic material, a single conductive wire serially disposed in parallel, circumferential channels defined in an outer surface of the mandrel, and a central bore defined axially and centrally through the mandrel. The portion of the shaft is inserted in the central bore and a direct current is provided through the wire to magnetize alternating N and S poles along the cylindrical shaft. The wire may be placed in the parallel, circumferential channels such that the direction of flow of a direct current in one channel is in the opposite direction of the flow in the adjacent channels.